maths

Ryan has the numbers 1–30 listed on individual index cards. If Ryan randomly selects 1 card, what is the probability that it will be a multiple of 3 or a multiple of 11?

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  1. multiples of 3 are 3n (3,6,9,12...)
    number of terms=10
    p(multiple of 3)=10/30
    multiples of11 11n(11,22)
    p(multiple of 11)=2/30
    p(multiple of 11 or 3)=10/30+2/30=6/15

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